Teeth whitening apparatus

ABSTRACT

A teeth whitening apparatus includes a first ultrasound generator directed to emit in a first direction into a particular area, a second ultrasound generator spaced from the first ultrasound generator on a first side of the first ultrasound generator and directed to emit in a second direction angled toward the first direction into the particular area, and a third ultrasound generator spaced from the first ultrasound generator and the second ultrasound generator on a second side of first ultrasound generator and directed to emit in a third direction angled toward the first direction and the second direction into the particular area. One or more light emitting devices are spaced from the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator, and directed to emit into the particular area.

BACKGROUND

With the growing desire for whiter teeth and the revolution of aesthetic treatment methods, teeth bleaching has become a popular procedure in recent years. Tooth whiteners including hydrogen peroxide as the main component have been widely accepted in both in-office and at-home tooth bleaching products. Conventional ways for the activation of hydrogen peroxide include heat, light, chemicals and their combinations. However, the application of heat has been discouraged owing to its potential to cause external root resorption. Currently, tooth whitening using light irradiation is mainly being commercialized. Various light sources have been used as a common approach to dissociate hydrogen peroxide during in-office bleaching treatments, such as halogen, plasma arc, light emitting diode (LEDs) and laser light sources. Ultrasonic devices have been used in endodontics to activate irrigating solutions.

SUMMARY

This Summary introduces simplified concepts that are further described below in the Detailed Description of Illustrative Embodiments. This Summary is not intended to identify key features or essential features of the claimed subject matter and is not intended to be used to limit the scope of the claimed subject matter.

A teeth whitening apparatus is provided. The apparatus includes a first ultrasound generator directed to emit in a first direction into a particular area, a second ultrasound generator spaced from the first ultrasound generator on a first side of the first ultrasound generator and directed to emit in a second direction angled toward the first direction into the particular area, and a third ultrasound generator spaced from the first ultrasound generator and the second ultrasound generator on a second side of first ultrasound generator and directed to emit in a third direction angled toward the first direction and the second direction into the particular area. One or more light emitting devices are spaced from the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator, and directed to emit into the particular area.

Also provided is a teeth whitening method. The teeth whitening method includes applying a dental whitening composition to teeth of a mouth. Light is emitted from a teeth whitening apparatus onto the teeth and the teeth whitening composition, and ultrasound is emitted toward the teeth at a plurality of angles from a plurality of sources of the teeth whitening apparatus.

Further provided is a system for teeth whitening. The system includes a teeth whitening composition including a peroxide composition and a catalyst. The system further includes a teeth whitening apparatus. The teeth whitening apparatus includes a first ultrasound generator, a second ultrasound generator, and a third ultrasound generator having a center frequency between 20 and 80 kHz, and one or more light emitting devices spaced from the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator.

BRIEF DESCRIPTION OF THE DRAWING(S)

A more detailed understanding may be had from the following description, given by way of example with the accompanying drawings. The Figures in the drawings and the detailed description are examples. The Figures and the detailed description are not to be considered limiting and other examples are possible. Like reference numerals in the Figures indicate like elements wherein:

FIG. 1 is a prospective view of a teeth whitening apparatus shown with venting apertures omitted.

FIG. 2 is a top plan view of the teeth whitening apparatus shown with venting apertures omitted.

FIG. 3 is a side elevation view of the teeth whitening apparatus of FIG. 1 shown in relation to a patient positioned for treatment by the teeth whitening apparatus.

FIG. 4 is a front elevation view of the teeth whitening apparatus of FIG. 1.

FIG. 5 is a top plan view of the teeth whitening apparatus of FIG. 1 with particular internal components exposed by removal of a cover of the apparatus.

FIG. 6 is a top plan view of a front portion of the teeth whitening apparatus of FIG. 1 with particular internal components exposed showing ultrasound directed toward teeth of a mouth.

FIG. 7 is a top plan view of a front portion of the teeth whitening apparatus of FIG. 1 with particular internal components exposed showing light directed toward teeth of the mouth.

FIG. 8 is a front elevation view of the teeth whitening apparatus of FIG. 1 with a cutaway showing ultrasound generators and showing ultrasound and light directed toward teeth of the mouth.

FIGS. 9A-9C are charts showing spectral power distribution of a light emitting diode (“LED”) array and halogen lamp of the teeth whitening apparatus of FIG. 1.

FIG. 10 is a flow chart showing a teeth whitening method.

FIG. 11A is rendering of a photograph of first test setup for visualizing effects of a single ultrasound generator.

FIG. 11B is a rendering of a photograph of a second test setup for visualizing effects of three ultrasound generators.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENT(S)

Illustrative embodiments are described below with reference to the drawing figures wherein like numerals represent like elements throughout. The terms “a” and “an” as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items. Any directional signal such as top, bottom, left, right, upper and lower are taken with reference to the orientation in the various figures.

Referring to FIGS. 1 through 8, a teeth whitening apparatus (hereinafter “apparatus”) 10 is shown according to an illustrative embodiment. The apparatus 10 includes mounting structure 12 for connection to a suitable appendage for positioning the apparatus in proximity to a mouth of a user, for example the mouth 4 of the patient 2. The apparatus 10 includes a first ultrasound generator 14 directed to emit ultrasound signals 14A in a first direction 14B, a second ultrasound generator 16 directed to emit ultrasound 16A in a second direction 16B angled toward the first direction 14B, and a third ultrasound generator 18 directed to emit ultrasound 18A in a third direction 18B angled toward the first direction 14B and the second direction 16B. The first, second, and third ultrasound generators 14, 16, 18 are disposed along a concave surface 20 of the apparatus 10. The ultrasound generators 14, 16, 18 align providing full mouth coverage and accelerating the release of active oxygen from a teeth whitening composition applied to teeth 6 during a teeth whitening treatment, which in turn reduces treatment duration and improves patient comfort during the teeth whitening treatment.

A halogen lamp 22 directs light through thermal lens 24, filter lens 26, and a plurality of optical fibers 30 to a first array of outputs 32 arranged in an elongated row and a second array of outputs 34 arranged in an elongated row spaced from the elongated row of the first array of outputs 32, the outputs 32, 34 including ends of the optical fibers 30. Beneficially, a total of about 200,000 optical fibers direct light from the halogen lamp 22 to a total of about 100,000 outputs 32 and 100,000 outputs 34. The halogen lamp 22 is a reflector lamp cup type beneficially a having maximum power rating of 100 watts at 12V and a color temperature of 3000K. The halogen lamp 22 is drivable by apparatus processor controls in a low mode, a medium mode, and a high mode, corresponding to illuminance of 170,000 lux, 220,000 lux, and 290,000 lux respectively. Beneficially, the halogen lamp 22 has a peak wavelength between 300 nm and 750 nm. More beneficially, the halogen lamp 22 has a peak wavelength between 400 nm and 650 nm. Referring to FIG. 9B, a curve 94 shows an exemplary relative spectral power of the halogen lamp 22 relative to wavelength in nanometers.

An array of light emitting diodes (“LEDs”) 36 are positioned between the first array of outputs 32 and the second array of outputs 34 of the plurality of optical fibers 30. The array of LEDs 36 beneficially has a power of about 12 watts at a voltage of about 9V to 10V. The array of LEDs 36 is drivable by apparatus processor controls in a low mode, a medium mode, and a high mode, corresponding to illuminance of 5000 lux, 7000 lux, and 9000 lux respectively. Beneficially, the array of LEDs has a peak wavelength between 400 nm and 525 nm. More beneficially, the array of LEDs 36 has a peak wavelength between 450 nm and 475 nm. Even more beneficially, the array of LEDs 36 has a peak wavelength between 460 nm and 465 nm. A transparent film sheet 40 is provided to protect the outputs 32, 32 and the array of LEDs 36. Referring to FIG. 9A, a curve 92 shows an exemplary relative spectral power of the array of LEDs 36 relative to wavelength in nanometers.

Referring to FIGS. 7 and 8, the first array of outputs 32 of the optical fibers 30 emit in a direction 52, the second array of outputs 34 of the optical fibers 30 emit in a direction 54, and the array of LEDs 36 emit in a direction 56. The light emissions in the directions 52, 54, 56 define three parallel planes which are perpendicular to the view of FIG. 8 and coplanar with the view of FIG. 7. Referring to FIG. 9C, a curve 96 shows an exemplary relative spectral power of the combination of the array of LEDs 36 and the halogen lamp 22 relative to wavelength in nanometers. The array of LEDs 36 and halogen lamp 22 light sources are adjustable by apparatus processor controls in different illuminance modes to allow a practitioner to adjust the illuminance according to different treatment conditions.

The first ultrasound generator 14, the second ultrasound generator 16, and the third ultrasound generator 18 are disposed along a curved path defined by the concave surface 20 of the apparatus 10 substantially aligned in a plane represented by line 8 in FIG. 4. Referring to FIG. 8, the first ultrasound generator 14, the second ultrasound generator 16, and the third ultrasound generator 18 are angled toward the first array of outputs 32, the second array of outputs 34, and the array of LEDs 36. The ultrasound generators 14, 16, 18 emit the ultrasound signals 14A, 16A, 18A in the directions 14B, 16B, 18B which are angled toward and pass through the planes defined by the directions 52, 54, 56 of the light emissions, whereby the first ultrasound generator 14, the second ultrasound generator 16, and the third ultrasound generator 18 are directed to emit through the planes.

The ultrasound generators 14, 16, 18 beneficially have a center frequency between 10 kHz and 500 kHz, and more beneficially between 20 kHz and 80 kHz. Ultrasound between 10 kHz and 500 kHz has been found to increase the activities of catalase, a common enzyme found in living organisms. Even more beneficially, the ultrasound generators 14, 16, 18 have a center frequency between 35 kHz and 45 kHz. Even more beneficially, the ultrasound generators 14, 16, 18 have a center frequency of about 40 kHz. The ultrasound generators 14, 16, 18 are beneficially provided as open integrally transmitting and receiving ultrasonic sensors. The first ultrasound generator 14 for example has a diameter of 12 mm and the second ultrasound generator 16 and the third ultrasound generator 18 for example have a diameter of 10 mm.

Referring to FIG. 10, a flowchart shows a teeth whitening method 200. While the method 200 and associated processes are described with reference to the components shown in FIGS. 1-8, including the teeth whitening apparatus 10 and constituent elements, the method 200 may alternatively be performed via other suitable devices and systems.

In a step 202, a dental whitening composition, also known as a “bleaching” composition, is prepared and applied to teeth 6 of a mouth 4. The dental whitening composition is beneficially a peroxide compound in a colloid gel including 3% to 45% hydrogen peroxide, more beneficially 30% to 40% hydrogen peroxide. Even more beneficially, the dental whitening composition is a two part gel including about 35% hydrogen peroxide in a first part and a catalyst including catalase in the second part, the two parts for example provided in a double barrel self-mixing syringe. Prior to application of the whitening composition, beneficially a cheek retractor is installed on the mouth 4 to facilitate access to the teeth 6, and the soft tissues of the gums of the teeth 6 are protected with a gingival barrier, for example a semi-fluid gingival barrier applied by syringe.

Light is emitted from a teeth whitening apparatus onto the teeth 6 and onto the teeth whitening composition (step 204), for example the apparatus 10 emitting light from the halogen lamp 22 and the array of LEDs 36. Ultrasound is emitted toward the teeth at a plurality of angles from a plurality of sources of the teeth whitening apparatus (step 206), for example by the first ultrasound generator 14, the second ultrasound generator 16, and the third ultrasound generator 18 of the apparatus 10. Steps 204 and 206 are beneficially performed simultaneously such that light and ultrasound are emitted at the same time. As shown in FIG. 6, the first ultrasound generator 14 is directed to emit in a first direction 14B toward a front of the mouth 4 toward the teeth 6, the second ultrasound generator 16 is spaced from the first ultrasound generator 14 on a first side of the first ultrasound generator 14 and directed to emit in a second direction 16B angled toward the first direction 14B toward a first side of the mouth 4 toward the teeth 6, and the third ultrasound generator 18 is spaced from the first ultrasound generator 14 and the second ultrasound generator 16 on a second side of first ultrasound generator 14 and directed to emit in a third direction 18B angled toward the first direction 14B and the second direction 16B toward a second side of the mouth toward the teeth 6.

The emitted light and ultrasound activates or accelerates activation of the teeth whitening composition. The hydrogen peroxide of the teeth whitening composition is activated by light and heat releasing active oxygen or hydroxyl radicals that can crack unsaturated double bonds of long, colored molecules on the teeth to achieve a bleaching effect. Ultrasonic energy accelerates the decomposition of the hydrogen peroxide or other peroxide composition (e.g., carbamide peroxide), accelerating the release of oxygen ions from the peroxide composition, which in turn increases the reaction rate and enhances the whitening of the teeth. Ultrasound also accelerates the diffusion of hydrogen peroxide into dental enamel to enhance whitening, wherein activated oxygen released accelerates diffusion of oxygen ions into the dental enamel. Ultrasound further increases activity of the activation catalyst, for example catalase enzyme, accelerating the decomposition of hydrogen peroxide.

EXAMPLES Example 1

In a first example test application of the teeth whitening apparatus 10, fifty-four (54) enamel disks 5×7 mm in diameter and 1.0 mm in thickness were prepared from bovine incisors sterilized with ethylene oxide. Half of the enamel disks were immersed in warm coffee solution (55° C.) for 24 hours, washed for 30s and stored in distilled water to create discolored enamel specimens, which were then divided into three (3) groups and subjected to whitening treatments with 35% H₂O₂ gel alone (GEL), 35% H₂O₂+480-520 nm blue light (GEL/LT), and 35% H₂O₂+blue light+40 KHz ultrasound (GEL/LT/US), respectively, using an example of the apparatus 10 for application of blue light and ultrasound. Whitening efficacies were measured with a spectrophotometer (Olympus CrystalEye™) in CIE Lab color space at 5, 15, 30, 45 and 60 minutes. The remaining twenty-seven (27) enamel disks were divided into three (3) groups and mounted on an artificial pulp chamber sealed with wax in the peripheral, and placed in 12-well sterile cells containing a 1.0 ml acetate buffer. To assess H₂O₂ diffusion, exposed enamel surfaces were treated with GEL, GEL/LT and GEL/LT/US as above, and an aliquot of 50 μl acetate buffer was collected at 5, 10, 15, 30, 45 and 60 minutes, respectively, to calculate the H₂O₂ concentration (μg/ml) in each treatment group using a leucocrystal violet/horseradish peroxidase assay. CIE Lab color changes (ΔE) and H₂O₂ diffusion were compared among the three (3) groups using ANOVA and post hoc PLSD tests.

There were no significant differences in ΔE at 5 minutes among the three groups, but ΔE were statistically significant higher in GEL/LT and GEL/LT/US than in GEL at 15 minutes, and higher in GEL/LT/US than in GEL and GEL/LT at 30, 45 and 60 minutes. It took 30 minutes for ΔE to reach 17.5 in GEL/LT/US, an equivalent of ten (10) shades change (from A4 to A2), as compared to 60 minutes in GEL/LT group (Table 1). Diffusion of peroxide through enamel was significantly higher in GEL/LT/US than in GEL and GEL/LT at 5 and 10 minutes. GEL/LT and GEL/LT/US showed significantly higher diffusion of peroxide than in GEL throughout the experimental period (Table 2). Addition of ultrasound enhanced efficacy of light-assisted tooth whitening and accelerated diffusion of H₂O₂ through dental enamel in vitro.

TABLE 1 ΔE at different treatment durations in the three comparison groups* GROUP 5 min 15 min 30 min 45 min 60 min GEL 3.8 ± 3.1a  7.3 ± 2.8b  9.3 ± 3.2d 11.5 ± 4.3de 13.2 ± 4.0f GEL/ 4.7 ± 1.6a  9.2 ± 1.4c 11.6 ± 2.3d 13.7 ± 3.3e 17.5 ± 4.5f LT GEL/ 4.4 ± 2.7a 11.8 ± 4.0c 17.6 ± 6.5e 21.3 ± 8.0f 23.5 ± 8.7g LT/US *ANOVA: different letters in the same column denote statistically significant differences (p < 0.05)

TABLE 2 Concentrations of peroxide (μg/ml) diffused through enamel disks (1.0 mm) at different treatment durations in the three comparison groups* Group 5 min 10 min 15 min 30 min 45 min 60 min GEL 0.3 ± 0.1a 0.9 ± 0.5b 1.2 ± 0.5e 4.6 ± 0.9g 6.6 ± 0.9j  8.6 ± 0.5m GEL/LT 1.4 ± 0.6b 2.2 ± 1.2c 5.4 ± 1.2f 6.8 ± 0.9h 9.3 ± 0.8k 10.2 ± 0.7n GEL/LT/US 3.2 ± 0.6c 4.6 ± 1.1d 5.5 ± 1.0f 6.9 ± 0.5h 9.4 ± 0.6k 10.2 ± 0.6n *ANOVA: different letters in the same column denote statistically significant differences (p < 0.05)

Example 2

Referring to FIG. 11A, in a first test setup, a single ultrasound generator 314 of the type described above was arranged on a first test platform 304. A ring 302 was dipped in a soap, water, and glycerin solution to create a bubble film 303 on the ring 302. The bubble film 303 was illuminated by a lighting apparatus 306 and a disturbance 308 was visible on the bubble film 303 demonstrating the unidirectional nature of ultrasound propagation.

Referring to FIG. 11B, in a second test setup, three ultrasound generators 414, 416, 418 of the type described above were arranged on a second test platform 404 approximating the arrangement of ultrasound generators 14, 16, 18 shown in FIGS. 4-8. The ring 302 was dipped in the soap, water, and glycerin solution to create a bubble film 403 on the ring 302. The bubble film 403 was illuminated by the lighting apparatus 306 and a plurality of distributed disturbances 408 were visible on the bubble film 403 evidencing the comprehensive coverage and beneficial distribution associated with the arrangement of the ultrasound generators 414, 416, 418 as compared to the arrangement of FIG. 11A.

Since ultrasound is a mechanical wave in a longitudinal direction, it can be focused and transmitted in a straight line. Due to the unidirectional ultrasound propagation effect, providing multiple ultrasound generators targeting the entire arch of the mouth provides beneficial results as evidenced by the second test setup as compared to the first test setup. The teeth whitening apparatus 10 of FIGS. 1-8 with the three ultrasound generators 14, 16, 18 provides more comprehensive coverage on the entire mouth as compared to a system implementing a single ultrasound generator. This enables reduced treatment duration and improved whitening outcomes, ultimately improving patient comfort and satisfaction.

Although features and elements are described above in particular combinations, one of ordinary skill in the art will appreciate that each feature or element can be used alone or in any combination with the other features and elements. While embodiments have been described in detail above, these embodiments are non-limiting and should be considered as merely exemplary. Modifications and extensions may be developed, and all such modifications are deemed to be within the scope defined by the appended claims. 

What is claimed is:
 1. A teeth whitening apparatus comprising: a first ultrasound generator directed to emit in a first direction into a particular area; a second ultrasound generator spaced from the first ultrasound generator on a first side of the first ultrasound generator and directed to emit in a second direction angled toward the first direction into the particular area; and at least one light emitting device spaced from the first ultrasound generator and the second ultrasound generator, and directed to emit into the particular area.
 2. The teeth whitening apparatus of claim 1, further comprising a third ultrasound generator spaced from the first ultrasound generator and the second ultrasound generator on a second side of first ultrasound generator and directed to emit in a third direction angled toward the first direction and the second direction into the particular area, the at least one light emitting device spaced from the third ultrasound generator.
 3. The teeth whitening apparatus of claim 2, wherein the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are disposed along a concave surface.
 4. The teeth whitening apparatus of claim 3, wherein the at least one light emitting device comprises a plurality of outputs arranged in an elongated row.
 5. The teeth whitening apparatus of claim 2, wherein: the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are disposed along a concave surface in a first row; and the at least one light emitting device comprises: a first array outputs arranged in a second row spaced from the first row; and a second array of outputs arranged in a third row spaced from the second row opposite the first row.
 6. The teeth whitening apparatus of claim 2, the at least one light emitting device comprising a light emitting diode (“LED”) array and a halogen lamp.
 7. The teeth whitening apparatus of claim 6, the at least one light emitting device further comprising a plurality of optical fibers arranged to direct light from the halogen lamp to a plurality of outputs arranged in substantial alignment with a concave surface.
 8. The teeth whitening apparatus of claim 7, the plurality of outputs of the plurality of optical fibers arranged in at least one elongated row.
 9. The teeth whitening apparatus of claim 2, the at least one light emitting device comprising: a lamp; and a plurality of optical fibers positioned to direct light from the lamp to a plurality of outputs directed to emit into the particular area.
 10. The teeth whitening apparatus of claim 2, the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are angled toward the at least one light emitting device.
 11. The teeth whitening apparatus of claim 2, wherein: the at least one light emitting device comprises a first plurality of outputs which emit in a first plane; and the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are disposed along a curved path in a second plane substantially parallel to the first plane.
 12. The teeth whitening apparatus of claim 11, wherein the first direction, the second direction and the third direction are angled toward the first plane whereby the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are directed to emit through the first plane.
 13. The teeth whitening apparatus of claim 12, wherein: the at least one light emitting device further comprises a second plurality of outputs which emit in a third plane substantially parallel to the first plane and the second plane; and the first direction, the second direction, and the third direction are angled toward the third plane whereby the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are directed to emit through the third plane.
 14. The teeth whitening apparatus of claim 2, wherein: the at least one light emitting device comprises a first plurality of outputs which emit in a first plane; and the first direction, the second direction and the third direction are angled toward the first plane whereby the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are directed to emit through the first plane.
 15. The teeth whitening apparatus of claim 14, wherein: the at least one light emitting device further comprises a second plurality of outputs which emit in a second plane substantially parallel to the first plane; and the first direction, the second direction, and the third direction are angled toward the second plane whereby the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator are directed to emit through the second plane.
 16. The teeth whitening apparatus of claim 15, the at least one light emitting device further comprising: a lamp; a first plurality of optical fibers positioned to direct light from the lamp to the first plurality of outputs, the first plurality of outputs comprising ends of the first plurality of optical fibers; and a second plurality of optical fibers positioned to direct light from the lamp to the second plurality of outputs, the second plurality of outputs comprising ends of the second plurality of optical fibers.
 17. The teeth whitening apparatus of claim 16, the at least one light emitting device further comprising an array of light emitting diodes (“LEDs”) positioned between the first plane and the second plane and directed to emit light between the first plane and the second plane.
 18. The teeth whitening apparatus of claim 2, the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator comprising a center frequency between 10 kHz and 500 kHz.
 19. The teeth whitening apparatus of claim 2, the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator comprising a center frequency between 20 kHz and 80 kHz.
 20. The teeth whitening apparatus of claim 2, the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator comprising a center frequency of about 40 kHz.
 21. The teeth whitening apparatus of claim 2, the at least one light emitting device comprising a peak wavelength between 400 nm-650 nm.
 22. The teeth whitening apparatus of claim 2, the at least one light emitting device comprising a peak wavelength between 450 nm-475 nm.
 23. The teeth whitening apparatus of claim 2, the at least one light emitting device comprising a light emitting diode (“LED”) array having a peak wavelength between 450 nm-475 nm and a halogen lamp having a peak wavelength between 400 nm-650 nm.
 24. A teeth whitening method comprising: applying a dental whitening composition to teeth of a mouth; emitting light onto the teeth and the teeth whitening composition from a teeth whitening apparatus; and emitting ultrasound toward the teeth at a plurality of angles from a plurality of sources of the teeth whitening apparatus.
 25. The teeth whitening method of claim 24, further comprising emitting the ultrasound from: a first ultrasound generator directed to emit in a first direction toward the teeth; a second ultrasound generator spaced from the first ultrasound generator on a first side of the first ultrasound generator and directed to emit in a second direction angled toward the first direction toward the teeth; and a third ultrasound generator spaced from the first ultrasound generator and the second ultrasound generator on a second side of first ultrasound generator and directed to emit in a third direction angled toward the first direction and the second direction toward the teeth.
 26. The teeth whitening method of claim 25, further comprising: the first ultrasound generator emitting toward a front of the mouth; the second ultrasound generator emitting toward a first side of the mouth; and the third ultrasound generator emitting toward a second side of the mouth.
 27. The teeth whitening method of claim 24, wherein applying the dental whitening composition comprises applying a composition comprising between 3% and 45% hydrogen peroxide.
 28. The teeth whitening method of claim 24, wherein applying the dental whitening composition comprises applying a composition comprising about 30% and 40% hydrogen peroxide.
 29. The teeth whitening method of claim 24, wherein applying the dental whitening composition comprises applying a composition comprising a catalyst.
 30. A system for teeth whitening comprising: a teeth whitening composition comprising a peroxide composition and a catalyst; and a teeth whitening apparatus comprising: a first ultrasound generator, a second ultrasound generator, and a third ultrasound generator having a center frequency between about 20 kHz and 80 kHz; and at least one light emitting device spaced from the first ultrasound generator, the second ultrasound generator, and the third ultrasound generator.
 31. The system for teeth whitening of claim 30, the peroxide composition comprising between 3% and 45% hydrogen peroxide. 